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                    Introduction
            
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                    快速上手
            
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                    5分钟了解TypeScript
            
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                    React与webpack
            
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                    React
            
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                    Angular 2
            
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                    从JavaScript迁移到TypeScript
            
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                    基础类型
            
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                    变量声明
            
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                    接口
            
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                    类
            
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                    函数
            
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                    泛型
            
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                    枚举
            
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                    类型推论
            
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                    类型兼容性
            
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                    高级类型
            
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                    实用工具类型
            
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                    Symbols
            
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                    Iterators 和 Generators
            
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                    模块
            
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                    命名空间
            
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                    命名空间和模块
            
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                    模块解析
            
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                    声明合并
            
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                    书写.d.ts文件
            
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                    JSX
            
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                    Decorators
            
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                    混入
            
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                    三斜线指令
            
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                    JavaScript文件里的类型检查
            
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                    如何书写声明文件
            
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                    结构
            
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                    规范
            
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                    举例
            
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                    深入
            
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                    发布
            
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                    使用
            
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                    工程配置
            
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                    tsconfig.json
            
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                    工程引用
            
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        <li class="chapter " data-level="1.5.3" data-path="../Typings for NPM Packages.html">
            
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                    NPM包的类型
            
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        <li class="chapter " data-level="1.5.4" data-path="../Compiler Options.html">
            
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                    编译选项
            
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                    配置 Watch
            
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        <li class="chapter " data-level="1.5.6" data-path="../Compiler Options in MSBuild.html">
            
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                    在MSBuild里使用编译选项
            
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                    与其它构建工具整合
            
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        <li class="chapter " data-level="1.5.8" data-path="../Nightly Builds.html">
            
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                    使用TypeScript的每日构建版本
            
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                    Wiki
            
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                    TypeScript里的this
            
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                    编码规范
            
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                    常见编译错误
            
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                    支持TypeScript的编辑器
            
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                    结合ASP.NET v5使用TypeScript
            
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        <li class="chapter " data-level="1.6.6" data-path="../../wiki/Architectural-Overview.html">
            
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                    架构概述
            
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        <li class="chapter " data-level="1.6.7" data-path="../../wiki/Roadmap.html">
            
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                    发展路线图
            
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        <li class="chapter " data-level="1.7" data-path="../../release-notes/">
            
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                    新增功能
            
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        <li class="chapter " data-level="1.7.1" data-path="../../release-notes/TypeScript 3.1.html">
            
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                    TypeScript 3.1
            
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        <li class="chapter " data-level="1.7.2" data-path="../../release-notes/TypeScript 3.0.html">
            
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                    TypeScript 3.0
            
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        <li class="chapter " data-level="1.7.3" data-path="../../release-notes/TypeScript 2.9.html">
            
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                    TypeScript 2.9
            
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        <li class="chapter " data-level="1.7.4" data-path="../../release-notes/TypeScript 2.8.html">
            
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                    TypeScript 2.8
            
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        <li class="chapter " data-level="1.7.5" data-path="../../release-notes/TypeScript 2.7.html">
            
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                    TypeScript 2.7
            
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        <li class="chapter " data-level="1.7.6" data-path="../../release-notes/TypeScript 2.6.html">
            
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                    TypeScript 2.6
            
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        <li class="chapter " data-level="1.7.7" data-path="../../release-notes/TypeScript 2.5.html">
            
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                    TypeScript 2.5
            
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        <li class="chapter " data-level="1.7.8" data-path="../../release-notes/TypeScript 2.4.html">
            
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                    TypeScript 2.4
            
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        <li class="chapter " data-level="1.7.9" data-path="../../release-notes/TypeScript 2.3.html">
            
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                    TypeScript 2.3
            
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        <li class="chapter " data-level="1.7.10" data-path="../../release-notes/TypeScript 2.2.html">
            
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                    TypeScript 2.2
            
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        <li class="chapter " data-level="1.7.11" data-path="../../release-notes/TypeScript 2.1.html">
            
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                    TypeScript 2.1
            
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        <li class="chapter " data-level="1.7.12" data-path="../../release-notes/TypeScript 2.0.html">
            
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                    TypeScript 2.0
            
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        <li class="chapter " data-level="1.7.13" data-path="../../release-notes/TypeScript 1.8.html">
            
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                    TypeScript 1.8
            
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        <li class="chapter " data-level="1.7.14" data-path="../../release-notes/TypeScript 1.7.html">
            
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                    TypeScript 1.7
            
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                    TypeScript 1.6
            
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                    TypeScript 1.5
            
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        <li class="chapter " data-level="1.7.17" data-path="../../release-notes/TypeScript 1.4.html">
            
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                    TypeScript 1.4
            
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                    TypeScript 1.3
            
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        <li class="chapter " data-level="1.7.19" data-path="../../release-notes/TypeScript 1.1.html">
            
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                    TypeScript 1.1
            
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        <li class="chapter " data-level="1.8" data-path="../../breaking-changes/breaking-changes.html">
            
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                    Breaking Changes
            
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        <li class="chapter " data-level="1.8.1" data-path="../../breaking-changes/TypeScript 2.4.html">
            
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                    TypeScript 2.4
            
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        <li class="chapter " data-level="1.8.2" data-path="../../breaking-changes/TypeScript 2.3.html">
            
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                    TypeScript 2.3
            
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        <li class="chapter " data-level="1.8.3" data-path="../../breaking-changes/TypeScript 2.2.html">
            
                <a href="../../breaking-changes/TypeScript 2.2.html">
            
                    
                    TypeScript 2.2
            
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        <li class="chapter " data-level="1.8.4" data-path="../../breaking-changes/TypeScript 2.1.html">
            
                <a href="../../breaking-changes/TypeScript 2.1.html">
            
                    
                    TypeScript 2.1
            
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        <li class="chapter " data-level="1.8.5" data-path="../../breaking-changes/TypeScript 2.0.html">
            
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                    TypeScript 2.0
            
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        <li class="chapter " data-level="1.8.6" data-path="../../breaking-changes/TypeScript 1.8.html">
            
                <a href="../../breaking-changes/TypeScript 1.8.html">
            
                    
                    TypeScript 1.8
            
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        <li class="chapter " data-level="1.8.7" data-path="../../breaking-changes/TypeScript 1.7.html">
            
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                    TypeScript 1.7
            
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                    TypeScript 1.6
            
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                    TypeScript 1.5
            
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                    TypeScript 1.4
            
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                                <section class="normal markdown-section">
                                
                                <h1 id="&#x7B80;&#x4ECB;">&#x7B80;&#x4ECB;</h1>
<p>&#x8FD9;&#x7BC7;&#x6307;&#x5357;&#x7684;&#x76EE;&#x7684;&#x662F;&#x6559;&#x4F60;&#x5982;&#x4F55;&#x4E66;&#x5199;&#x9AD8;&#x8D28;&#x91CF;&#x7684;TypeScript&#x58F0;&#x660E;&#x6587;&#x4EF6;&#x3002;
&#x6211;&#x4EEC;&#x5728;&#x8FD9;&#x91CC;&#x4F1A;&#x5C55;&#x793A;&#x4E00;&#x4E9B;API&#x7684;&#x6587;&#x6863;&#xFF0C;&#x8FD8;&#x6709;&#x5B83;&#x4EEC;&#x7684;&#x4F7F;&#x7528;&#x793A;&#x4F8B;&#xFF0C;
  &#x5E76;&#x4E14;&#x9610;&#x8FF0;&#x4E86;&#x5982;&#x4F55;&#x4E3A;&#x5B83;&#x4EEC;&#x4E66;&#x5199;&#x58F0;&#x660E;&#x6587;&#x4EF6;&#x3002;</p>
<p>&#x8FD9;&#x4E9B;&#x4F8B;&#x5B50;&#x662F;&#x6309;&#x590D;&#x6742;&#x5EA6;&#x9012;&#x589E;&#x7684;&#x987A;&#x5E8F;&#x7EC4;&#x7EC7;&#x7684;&#x3002;</p>
<ul>
<li><a href="#global-variables">&#x5168;&#x5C40;&#x53D8;&#x91CF;</a></li>
<li><a href="#global-functions">&#x5168;&#x5C40;&#x51FD;&#x6570;</a></li>
<li><a href="#objects-with-properties">&#x5E26;&#x5C5E;&#x6027;&#x7684;&#x5BF9;&#x8C61;</a></li>
<li><a href="#overloaded-functions">&#x51FD;&#x6570;&#x91CD;&#x8F7D;</a></li>
<li><a href="#reusable-types-interfaces">&#x53EF;&#x91CD;&#x7528;&#x7C7B;&#x578B;&#xFF08;&#x63A5;&#x53E3;&#xFF09;</a></li>
<li><a href="#reusable-types-type-aliases">&#x53EF;&#x91CD;&#x7528;&#x7C7B;&#x578B;&#xFF08;&#x7C7B;&#x578B;&#x522B;&#x540D;&#xFF09;</a></li>
<li><a href="#organizing-types">&#x7EC4;&#x7EC7;&#x7C7B;&#x578B;</a></li>
<li><a href="#classes">&#x7C7B;</a></li>
</ul>
<h1 id="&#x4F8B;&#x5B50;">&#x4F8B;&#x5B50;</h1>
<h2 id="&#x5168;&#x5C40;&#x53D8;&#x91CF;"><a name="global-variables"></a>&#x5168;&#x5C40;&#x53D8;&#x91CF;</h2>
<p><em>&#x6587;&#x6863;</em></p>
<blockquote>
<p>&#x5168;&#x5C40;&#x53D8;&#x91CF;<code>foo</code>&#x5305;&#x542B;&#x4E86;&#x5B58;&#x5728;&#x7EC4;&#x4EF6;&#x603B;&#x6570;&#x3002;</p>
</blockquote>
<p><em>&#x4EE3;&#x7801;</em></p>
<pre><code class="lang-ts"><span class="hljs-built_in">console</span>.log(<span class="hljs-string">&quot;Half the number of widgets is &quot;</span> + (foo / <span class="hljs-number">2</span>));
</code></pre>
<p><em>&#x58F0;&#x660E;</em></p>
<p>&#x4F7F;&#x7528;<code>declare var</code>&#x58F0;&#x660E;&#x53D8;&#x91CF;&#x3002;
&#x5982;&#x679C;&#x53D8;&#x91CF;&#x662F;&#x53EA;&#x8BFB;&#x7684;&#xFF0C;&#x90A3;&#x4E48;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;<code>declare const</code>&#x3002;
&#x4F60;&#x8FD8;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;<code>declare let</code>&#x5982;&#x679C;&#x53D8;&#x91CF;&#x62E5;&#x6709;&#x5757;&#x7EA7;&#x4F5C;&#x7528;&#x57DF;&#x3002;</p>
<pre><code class="lang-ts"><span class="hljs-comment">/** &#x7EC4;&#x4EF6;&#x603B;&#x6570; */</span>
<span class="hljs-keyword">declare</span> <span class="hljs-keyword">var</span> foo: <span class="hljs-built_in">number</span>;
</code></pre>
<h2 id="&#x5168;&#x5C40;&#x51FD;&#x6570;"><a name="global-functions"></a>&#x5168;&#x5C40;&#x51FD;&#x6570;</h2>
<p><em>&#x6587;&#x6863;</em></p>
<blockquote>
<p>&#x7528;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;&#x53C2;&#x6570;&#x8C03;&#x7528;<code>greet</code>&#x51FD;&#x6570;&#x5411;&#x7528;&#x6237;&#x663E;&#x793A;&#x4E00;&#x6761;&#x6B22;&#x8FCE;&#x4FE1;&#x606F;&#x3002;</p>
</blockquote>
<p><em>&#x4EE3;&#x7801;</em></p>
<pre><code class="lang-ts">greet(<span class="hljs-string">&quot;hello, world&quot;</span>);
</code></pre>
<p><em>&#x58F0;&#x660E;</em></p>
<p>&#x4F7F;&#x7528;<code>declare function</code>&#x58F0;&#x660E;&#x51FD;&#x6570;&#x3002;</p>
<pre><code class="lang-ts"><span class="hljs-keyword">declare</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">greet</span>(<span class="hljs-params">greeting: <span class="hljs-built_in">string</span></span>): <span class="hljs-title">void</span></span>;
</code></pre>
<h2 id="&#x5E26;&#x5C5E;&#x6027;&#x7684;&#x5BF9;&#x8C61;"><a name="objects-with-properties"></a>&#x5E26;&#x5C5E;&#x6027;&#x7684;&#x5BF9;&#x8C61;</h2>
<p><em>&#x6587;&#x6863;</em></p>
<blockquote>
<p>&#x5168;&#x5C40;&#x53D8;&#x91CF;<code>myLib</code>&#x5305;&#x542B;&#x4E00;&#x4E2A;<code>makeGreeting</code>&#x51FD;&#x6570;&#xFF0C;
&#x8FD8;&#x6709;&#x4E00;&#x4E2A;&#x5C5E;&#x6027;<code>numberOfGreetings</code>&#x6307;&#x793A;&#x76EE;&#x524D;&#x4E3A;&#x6B62;&#x6B22;&#x8FCE;&#x6570;&#x91CF;&#x3002;</p>
</blockquote>
<p><em>&#x4EE3;&#x7801;</em></p>
<pre><code class="lang-ts"><span class="hljs-keyword">let</span> result = myLib.makeGreeting(<span class="hljs-string">&quot;hello, world&quot;</span>);
<span class="hljs-built_in">console</span>.log(<span class="hljs-string">&quot;The computed greeting is:&quot;</span> + result);

<span class="hljs-keyword">let</span> count = myLib.numberOfGreetings;
</code></pre>
<p><em>&#x58F0;&#x660E;</em></p>
<p>&#x4F7F;&#x7528;<code>declare namespace</code>&#x63CF;&#x8FF0;&#x7528;&#x70B9;&#x8868;&#x793A;&#x6CD5;&#x8BBF;&#x95EE;&#x7684;&#x7C7B;&#x578B;&#x6216;&#x503C;&#x3002;</p>
<pre><code class="lang-ts"><span class="hljs-keyword">declare</span> <span class="hljs-keyword">namespace</span> myLib {
    <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">makeGreeting</span>(<span class="hljs-params">s: <span class="hljs-built_in">string</span></span>): <span class="hljs-title">string</span></span>;
    <span class="hljs-keyword">let</span> numberOfGreetings: <span class="hljs-built_in">number</span>;
}
</code></pre>
<h2 id="&#x51FD;&#x6570;&#x91CD;&#x8F7D;"><a name="overloaded-functions"></a>&#x51FD;&#x6570;&#x91CD;&#x8F7D;</h2>
<p><em>&#x6587;&#x6863;</em></p>
<blockquote>
<p><code>getWidget</code>&#x51FD;&#x6570;&#x63A5;&#x6536;&#x4E00;&#x4E2A;&#x6570;&#x5B57;&#xFF0C;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x7EC4;&#x4EF6;&#xFF0C;&#x6216;&#x63A5;&#x6536;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;&#x5E76;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x7EC4;&#x4EF6;&#x6570;&#x7EC4;&#x3002;</p>
</blockquote>
<p><em>&#x4EE3;&#x7801;</em></p>
<pre><code class="lang-ts"><span class="hljs-keyword">let</span> x: Widget = getWidget(<span class="hljs-number">43</span>);

<span class="hljs-keyword">let</span> arr: Widget[] = getWidget(<span class="hljs-string">&quot;all of them&quot;</span>);
</code></pre>
<p><em>&#x58F0;&#x660E;</em></p>
<pre><code class="lang-ts">declare function getWidget(n: number): Widget;
declare function getWidget(s: string): Widget[];
</code></pre>
<h2 id="&#x53EF;&#x91CD;&#x7528;&#x7C7B;&#x578B;&#xFF08;&#x63A5;&#x53E3;&#xFF09;"><a name="reusable-types-interfaces"></a>&#x53EF;&#x91CD;&#x7528;&#x7C7B;&#x578B;&#xFF08;&#x63A5;&#x53E3;&#xFF09;</h2>
<p><em>&#x6587;&#x6863;</em></p>
<blockquote>
<p>&#x5F53;&#x6307;&#x5B9A;&#x4E00;&#x4E2A;&#x6B22;&#x8FCE;&#x8BCD;&#x65F6;&#xFF0C;&#x4F60;&#x5FC5;&#x987B;&#x4F20;&#x5165;&#x4E00;&#x4E2A;<code>GreetingSettings</code>&#x5BF9;&#x8C61;&#x3002;
&#x8FD9;&#x4E2A;&#x5BF9;&#x8C61;&#x5177;&#x6709;&#x4EE5;&#x4E0B;&#x51E0;&#x4E2A;&#x5C5E;&#x6027;&#xFF1A;</p>
<p>1- greeting&#xFF1A;&#x5FC5;&#x9700;&#x7684;&#x5B57;&#x7B26;&#x4E32;</p>
<p>2- duration: &#x53EF;&#x9760;&#x7684;&#x65F6;&#x957F;&#xFF08;&#x6BEB;&#x79D2;&#x8868;&#x793A;&#xFF09;</p>
<p>3- color: &#x53EF;&#x9009;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x6BD4;&#x5982;&#x2018;#ff00ff&#x2019;</p>
</blockquote>
<p><em>&#x4EE3;&#x7801;</em></p>
<pre><code class="lang-ts">greet({
  greeting: <span class="hljs-string">&quot;hello world&quot;</span>,
  duration: <span class="hljs-number">4000</span>
});
</code></pre>
<p><em>&#x58F0;&#x660E;</em></p>
<p>&#x4F7F;&#x7528;<code>interface</code>&#x5B9A;&#x4E49;&#x4E00;&#x4E2A;&#x5E26;&#x6709;&#x5C5E;&#x6027;&#x7684;&#x7C7B;&#x578B;&#x3002;</p>
<pre><code class="lang-ts"><span class="hljs-keyword">interface</span> GreetingSettings {
  greeting: <span class="hljs-built_in">string</span>;
  duration?: <span class="hljs-built_in">number</span>;
  color?: <span class="hljs-built_in">string</span>;
}

<span class="hljs-keyword">declare</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">greet</span>(<span class="hljs-params">setting: GreetingSettings</span>): <span class="hljs-title">void</span></span>;
</code></pre>
<h2 id="&#x53EF;&#x91CD;&#x7528;&#x7C7B;&#x578B;&#xFF08;&#x7C7B;&#x578B;&#x522B;&#x540D;&#xFF09;"><a name="reusable-types-type-aliases"></a>&#x53EF;&#x91CD;&#x7528;&#x7C7B;&#x578B;&#xFF08;&#x7C7B;&#x578B;&#x522B;&#x540D;&#xFF09;</h2>
<p><em>&#x6587;&#x6863;</em></p>
<blockquote>
<p>&#x5728;&#x4EFB;&#x4F55;&#x9700;&#x8981;&#x6B22;&#x8FCE;&#x8BCD;&#x7684;&#x5730;&#x65B9;&#xFF0C;&#x4F60;&#x53EF;&#x4EE5;&#x63D0;&#x4F9B;&#x4E00;&#x4E2A;<code>string</code>&#xFF0C;&#x4E00;&#x4E2A;&#x8FD4;&#x56DE;<code>string</code>&#x7684;&#x51FD;&#x6570;&#x6216;&#x4E00;&#x4E2A;<code>Greeter</code>&#x5B9E;&#x4F8B;&#x3002;</p>
</blockquote>
<p><em>&#x4EE3;&#x7801;</em></p>
<pre><code class="lang-ts"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">getGreeting</span>(<span class="hljs-params"></span>) </span>{
    <span class="hljs-keyword">return</span> <span class="hljs-string">&quot;howdy&quot;</span>;
}
<span class="hljs-keyword">class</span> MyGreeter extends Greeter { }

greet(<span class="hljs-string">&quot;hello&quot;</span>);
greet(getGreeting);
greet(<span class="hljs-keyword">new</span> MyGreeter());
</code></pre>
<p><em>&#x58F0;&#x660E;</em></p>
<p>&#x4F60;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x7C7B;&#x578B;&#x522B;&#x540D;&#x6765;&#x5B9A;&#x4E49;&#x7C7B;&#x578B;&#x7684;&#x77ED;&#x540D;&#xFF1A;</p>
<pre><code class="lang-ts"><span class="hljs-keyword">type</span> GreetingLike = <span class="hljs-built_in">string</span> | (() =&gt; <span class="hljs-built_in">string</span>) | MyGreeter;

<span class="hljs-keyword">declare</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">greet</span>(<span class="hljs-params">g: GreetingLike</span>): <span class="hljs-title">void</span></span>;
</code></pre>
<h2 id="&#x7EC4;&#x7EC7;&#x7C7B;&#x578B;"><a name="organizing-types"></a>&#x7EC4;&#x7EC7;&#x7C7B;&#x578B;</h2>
<p><em>&#x6587;&#x6863;</em></p>
<blockquote>
<p><code>greeter</code>&#x5BF9;&#x8C61;&#x80FD;&#x591F;&#x8BB0;&#x5F55;&#x5230;&#x6587;&#x4EF6;&#x6216;&#x663E;&#x793A;&#x4E00;&#x4E2A;&#x8B66;&#x544A;&#x3002;
&#x4F60;&#x53EF;&#x4EE5;&#x4E3A;<code>.log(...)</code>&#x63D0;&#x4F9B;LogOptions&#x548C;&#x4E3A;<code>.alert(...)</code>&#x63D0;&#x4F9B;&#x9009;&#x9879;&#x3002;</p>
</blockquote>
<p><em>&#x4EE3;&#x7801;</em></p>
<pre><code class="lang-ts"><span class="hljs-keyword">const</span> g = <span class="hljs-keyword">new</span> Greeter(<span class="hljs-string">&quot;Hello&quot;</span>);
g.log({ verbose: <span class="hljs-literal">true</span> });
g.alert({ modal: <span class="hljs-literal">false</span>, title: <span class="hljs-string">&quot;Current Greeting&quot;</span> });
</code></pre>
<p><em>&#x58F0;&#x660E;</em></p>
<p>&#x4F7F;&#x7528;&#x547D;&#x540D;&#x7A7A;&#x95F4;&#x7EC4;&#x7EC7;&#x7C7B;&#x578B;&#x3002;</p>
<pre><code class="lang-ts"><span class="hljs-keyword">declare</span> <span class="hljs-keyword">namespace</span> GreetingLib {
    <span class="hljs-keyword">interface</span> LogOptions {
        verbose?: <span class="hljs-built_in">boolean</span>;
    }
    <span class="hljs-keyword">interface</span> AlertOptions {
        modal: <span class="hljs-built_in">boolean</span>;
        title?: <span class="hljs-built_in">string</span>;
        color?: <span class="hljs-built_in">string</span>;
    }
}
</code></pre>
<p>&#x4F60;&#x4E5F;&#x53EF;&#x4EE5;&#x5728;&#x4E00;&#x4E2A;&#x58F0;&#x660E;&#x4E2D;&#x521B;&#x5EFA;&#x5D4C;&#x5957;&#x7684;&#x547D;&#x540D;&#x7A7A;&#x95F4;&#xFF1A;</p>
<pre><code class="lang-ts"><span class="hljs-keyword">declare</span> <span class="hljs-keyword">namespace</span> GreetingLib.Options {
    <span class="hljs-comment">// Refer to via GreetingLib.Options.Log</span>
    <span class="hljs-keyword">interface</span> Log {
        verbose?: <span class="hljs-built_in">boolean</span>;
    }
    <span class="hljs-keyword">interface</span> Alert {
        modal: <span class="hljs-built_in">boolean</span>;
        title?: <span class="hljs-built_in">string</span>;
        color?: <span class="hljs-built_in">string</span>;
    }
}
</code></pre>
<h2 id="&#x7C7B;"><a name="classes"></a>&#x7C7B;</h2>
<p><em>&#x6587;&#x6863;</em></p>
<blockquote>
<p>&#x4F60;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x5B9E;&#x4F8B;&#x5316;<code>Greeter</code>&#x5BF9;&#x8C61;&#x6765;&#x521B;&#x5EFA;&#x6B22;&#x8FCE;&#x8BCD;&#xFF0C;&#x6216;&#x8005;&#x7EE7;&#x627F;<code>Greeter</code>&#x5BF9;&#x8C61;&#x6765;&#x81EA;&#x5B9A;&#x4E49;&#x6B22;&#x8FCE;&#x8BCD;&#x3002;</p>
</blockquote>
<p><em>&#x4EE3;&#x7801;</em></p>
<pre><code class="lang-ts"><span class="hljs-keyword">const</span> myGreeter = <span class="hljs-keyword">new</span> Greeter(<span class="hljs-string">&quot;hello, world&quot;</span>);
myGreeter.greeting = <span class="hljs-string">&quot;howdy&quot;</span>;
myGreeter.showGreeting();

<span class="hljs-keyword">class</span> SpecialGreeter extends Greeter {
    <span class="hljs-keyword">constructor</span>() {
        <span class="hljs-keyword">super</span>(<span class="hljs-string">&quot;Very special greetings&quot;</span>);
    }
}
</code></pre>
<p><em>&#x58F0;&#x660E;</em></p>
<p>&#x4F7F;&#x7528;<code>declare class</code>&#x63CF;&#x8FF0;&#x4E00;&#x4E2A;&#x7C7B;&#x6216;&#x50CF;&#x7C7B;&#x4E00;&#x6837;&#x7684;&#x5BF9;&#x8C61;&#x3002;
&#x7C7B;&#x53EF;&#x4EE5;&#x6709;&#x5C5E;&#x6027;&#x548C;&#x65B9;&#x6CD5;&#xFF0C;&#x5C31;&#x548C;&#x6784;&#x9020;&#x51FD;&#x6570;&#x4E00;&#x6837;&#x3002;</p>
<pre><code class="lang-ts"><span class="hljs-keyword">declare</span> <span class="hljs-keyword">class</span> Greeter {
    <span class="hljs-keyword">constructor</span>(greeting: string);

    greeting: string;
    showGreeting(): void;
}
</code></pre>
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